Bump ch.qos.logback:logback-classic from 1.6.1 to 1.6.3 (#447)

Bumps [ch.qos.logback:logback-classic](https://github.com/qos-ch/logback) from 1.6.1 to 1.6.3.
- [Release notes](https://github.com/qos-ch/logback/releases)
- [Commits](qos-ch/logback@v_1.6.1...v_1.6.3)

---
updated-dependencies:
- dependency-name: ch.qos.logback:logback-classic
  dependency-version: 1.6.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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net.sourceforge.pmd.eclipse.plugin/pom.xml

@@ -44,7 +44,7 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.6.1</version>
+      <version>1.6.3</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>